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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/61275] Invalid initialization expression for ALLOCATABLE component in structure constructor at (1)
Date: Fri, 20 Mar 2015 14:57:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61275

--- Comment #8 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
module A

    Type T
    character(LEN=:), allocatable :: S
    end type
    character(len=6), parameter :: str = 'string'
    Type(T) :: TestObj = T(str)

end module

is rejected with

     Type(T) :: TestObj = T(str)
                           1
Error: Invalid initialization expression for ALLOCATABLE component 's' in
structure constructor at (1)

So it seems that

>      (a) an allocatable component is a reference to the intrinsic function NULL,

has to be taken in the most restrictive way.

If nobody objects, I'll close the PR as FIXED again.